Dynamic pressure
Kinetic energy per unit volume of a fluid / From Wikipedia, the free encyclopedia
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In fluid dynamics, dynamic pressure (denoted by q or Q and sometimes called velocity pressure) is the quantity defined by:[1]
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where (in SI units):
- q is the dynamic pressure in pascals (i.e., kg/(m*s2),
- ρ (Greek letter rho) is the fluid mass density (e.g. in kg/m3), and
- u is the flow speed in m/s.
It can be thought of as the fluid's kinetic energy per unit volume.
For incompressible flow, the dynamic pressure of a fluid is the difference between its total pressure and static pressure. From Bernoulli's law, dynamic pressure is given by
where p0 and ps are the total and static pressures, respectively.